(Exo 19:12-13 KJV) And thou shalt set bounds unto the people round
about, saying, Take heed to yourselves, that ye go not up into
the mount, or touch the border of it: whosoever toucheth the mount shall be
surely put to death: {13} There shall not an hand touch it, but he
shall surely be stoned, or shot through; whether it be beast or man,
it shall not live: when the trumpet soundeth long, they shall come up to the
mount.

The part which is omitted in the modern versions is part of the penalty
attached to any man or animal which approached Mount Sinai. If either had
touched it, then they were to be stoned or shot through. If the violator was
close at hand, they could be stoned by the people but if they were at a
distance, then the people would shoot arrows at them so there would be no
fear of another casualty by approaching the mountain. The Greek word
“bolidi” can refer to a javelin, spear, arrow, or dart. There is no
legitimate reason for this second penalty to have been omitted.